Uploading files to website

I have bought a yahoo webhosting and did my website with serif.

I cant upload the videos i have using smart ftp or even serif

here are the messages from all the places

Last Command:Uploading file (maroon glove sample.mpg) to (/philip2004uk/)

200 Type set to I.
227 Entering Passive Mode
553-The name you specified is not allowed.
553-Names must contain only ASCII letters (a-z,A-Z), digits (0-9), underscore, dot and dash.
553-Names must not start with a dot (.) or dash (-).
553-For additional info please visit:
553-See http://help.yahoo.com/help/us/webhosting/gftp/

its ok i tried clicking a page in the website then it worked but i thought it would work on the main website address